ATOMIC ABSORPTION SPECTROSCOPY.
Abstract
Sputtering in low pressure discharge has been experimentally studied both as a source of atomic vapor and as a source of resonance radiation in atomic absorption spectroscopy. The high intensity of resonance radiation emitted by sputtered atoms in a low pressure discharge interferes strongly with absorption measurements and sensitivities achieved as a vapor source are unsatisfactory for most absorption studies. Emission intensity measurements show that sputtering in a low pressure discharge provides resonance lines of much greater intensity than in hollow cathode lamps. A Fabry-Perot interferometer has been used to compare resonance lines from hollow cathode lamps with resonance lines from a low pressure discharge. Self-absorption is found in hollow cathode lamps even at low operating currents but is not found in the low pressure discharge light source. Calibration curves obtained under identical experimental conditions show that sensitivities obtained with the low pressure discharge light source in atomic absorption are equal to or better than the best obtained with hollow cathode lamps. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1966
- Accession Number
- AD0487556
Entities
People
- Gerhard K. Kramer
- Robley V. Stuart